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Don't change mc_dbx because we would need to undo the change if
the txn aborts. Make the fix (for get) match existing code for put.

This reverts commit ce7ba0ce.

Revert "ITS#8117 fix INTEGERDUP compare"

This reverts commit ed13d4aa.

(Probably fixes the ITS, definitely fixes a bug) when collapsing
the root page, fixups of other cursors was incomplete.

Fix mdb_txn_begin(&read-only txn) calls. Test mdb_env_set_maxreaders().
Rename DBI open/close functions. Move mdb_dbi_close() out of txn.

More fallout from 4d02c741.

Fallout from 4d02c741. The flags
were ignored: mdb_txn_renew0/begin cleared and/or did not set them.

Reverts part of a2ac1010.
MDB_ROBUST needed to be accepted, but that flag is gone.

Check for ext3/ext4 fs, then check kernel version.

This reverts commit 293d6bb4.

Revert "Simpler fdatasync hack"

This reverts commit 9585c012.

This reverts commit 985bbbbd.

Revert "Hack for potential ext3/ext4 corruption issue"

This reverts commit 0018eeb2.